It is known that the clinical course of thromboembolism may consist of several episodes, the "light" intervals between which may fluctuate from several hours to several days. Owing to these intervals, surgical prevention of recurrent thromboembolisms became possible and available. Based on long-term follow up of clinical patterns of the diseases, we suppose that it is possible to single out yet another special type of the disease's course which we termed uninterruptedly relapsing pulmonary artery thromboembolism. The essence of the process chiefly consists in that these fits appear to occur with very short intervals thus making it possible to suppose a recurring rupture of the embolising materia,from the thrombus with the resulting occlusion of the branches (more often small ones) of the pulmonary artery.